CN202998052U - Discrete input control circuit and airplane electronic device - Google Patents
Discrete input control circuit and airplane electronic device Download PDFInfo
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- CN202998052U CN202998052U CN 201220609661 CN201220609661U CN202998052U CN 202998052 U CN202998052 U CN 202998052U CN 201220609661 CN201220609661 CN 201220609661 CN 201220609661 U CN201220609661 U CN 201220609661U CN 202998052 U CN202998052 U CN 202998052U
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Abstract
The utility model relates to the field of technical aeronautics and especially relates to a discrete input control circuit and an airplane electronic device. An input terminal of the discrete input control circuit is connected with an input/output connector while an output terminal of the discrete input control circuit is connected with an MCU. The discrete input control circuit includes an overvoltage protection unit provided with an input terminal connected with the input/output connector and used for inputting discrete signals and preventing over-high voltage from damaging a rear-end circuit; and a signal converting unit provided with an input terminal connected with an output terminal of the over-voltage protection unit and an output terminal connected with the MCU and used for converting discrete signals passing through the overvoltage protection unit to discrete signals used by the rear-end circuit. According to the utility model, a fact that a device cannot be damaged by over-high voltage input from an external device when the device is in connection is guaranteed. At the same time, changes of electric levels of the external device can be responded at any time.
Description
Technical field
The utility model relates to the aeronautical technology field, relates in particular to a kind of control circuit and air electronics of discrete input.
Background technology
When interconnecting between air electronics, be generally Low level effective, the signal one that external equipment provides is removed and is defaulted as high level, because different peripheral apparatus producer is different, the amplitude of the acquiescence level that provides is also different, and can damage one's own side's equipment when peripheral hardware output acquiescence level is too high when connecting, and the difference of acquiescence level magnitude also can cause one's own side's equipment to produce erroneous judgement and the action that makes the mistake.
The utility model content
Main purpose of the present utility model is to provide a kind of control circuit of discrete input, be intended to solve when peripheral hardware output acquiescence level is too high when is connected with peripheral hardware at present and can damage one's own side's equipment, and the difference of acquiescence level magnitude also can cause the generation of one's own side's equipment to be judged by accident and the action problem that makes the mistake.
The utility model is achieved in that a kind of control circuit of discrete input, and input is connected with input and output connector, and output is connected with MCU, and the control circuit of described discrete input comprises:
Input is connected with described input and output connector, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit, and output is connected with described MCU, will be converted to through the discrete signal of Overvoltage protecting unit the signal conversion unit of the discrete signal of back-end circuit use.
Another purpose of the present utility model is to provide a kind of air electronics, and described air electronics comprises the control circuit that input is connected with the input and output connector of peripheral hardware, output is connected with the MCU of air electronics, and described control circuit comprises:
Input is connected with the input and output connector of described peripheral hardware, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit, and output is connected with the MCU of described air electronics, will be converted to through the discrete signal of Overvoltage protecting unit the signal conversion unit of the discrete signal of back-end circuit use.
In the utility model, when the overtension of not come by the peripheral apparatus input damages, can respond at any time again the variation of peripheral apparatus level when guaranteeing one's own side's equipment in interconnection.
Description of drawings
Fig. 1 is the structural representation of the control circuit of the discrete input that provides of the utility model embodiment;
Fig. 2 is the physical circuit figure of the control circuit of the discrete input that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, principle and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
In the utility model, the overtension that utilizes Overvoltage protecting unit to prevent that one's own side's equipment from not come by the peripheral apparatus input when interconnection damages, and utilizes signal conversion unit to respond at any time the variation of peripheral apparatus level.
Fig. 1 shows the structure of the control circuit of the discrete input that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model, and details are as follows.
Main purpose of the present utility model is to provide a kind of control circuit of discrete input, and input is connected with input and output connector, and output is connected with MCU, and the control circuit of described discrete input comprises:
Input is connected with described input and output connector, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit 100 of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit 100, and output is connected with described MCU, will be converted to through the discrete signal of Overvoltage protecting unit 100 signal conversion unit 200 of the discrete signal of back-end circuit use.
Fig. 2 shows the physical circuit of the control circuit of the discrete input that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model, and details are as follows.
As the utility model one embodiment, described Overvoltage protecting unit 100 comprises:
Diode D101, resistance R 101;
The negative electrode of described diode D101 is as the input of described Overvoltage protecting unit 100; be connected with input and output connector; the anode of described diode D101 is as the output of described Overvoltage protecting unit 100; be connected with the first end of resistance R 101, the second end of described resistance R 101 is connected with the first power supply VCC1.
As the utility model one embodiment, the voltage of described the first power supply VCC1 is 28V.
As the utility model one embodiment, described signal conversion unit 200 comprises:
Resistance R 201, resistance R 202, resistance R 203, resistance R 204, resistance R 205, resistance R 206, resistance R 207, capacitor C 201, capacitor C 202, capacitor C 204, comparator U201;
the first end of described resistance R 201 is as the input of described signal conversion unit 200, the second end of described resistance R 201 respectively with the first end of capacitor C 201, the first end of resistance R 202, the first end of the inverting input of comparator U201 and resistance R 205 connects, the second end of described capacitor C 201 is connected with the second end and the ground of resistance R 202 respectively, the in-phase input end of comparator U201 is connected with the first end of resistance R 203 and the first end of resistance R 204 respectively, the second end of described resistance R 203 is connected with power supply VCC2, the second end ground connection of described resistance R 204, the earth terminal ground connection of described comparator U201, the power end of described comparator U201 respectively with power supply VCC2, the first end of the first end of capacitor C 202 and capacitor C 203 connects, the second end of described capacitor C 202 is connected with the second end and the ground of capacitor C 203 respectively, the output of described comparator U201 respectively with the second end of resistance R 205, the first end of the first end of resistance R 206 and resistance R 207 connects, the second end of described resistance R 206 is connected with power supply VCC2, the second end of resistance R 207 is as the output of described signal conversion unit 200, be connected with described MCU.
As the utility model one embodiment, the voltage of described power supply VCC2 is 5V.
As the utility model one embodiment, described comparator U201 is the LM2903M chip.
Operation principle is as follows:
When from input and output connector input discrete signal, the inverting input reference level of setting comparator U201 is about 1.77V, and 1.77V is that the 5V voltage of VCC2 obtains by resistance R 203 and resistance R 204 dividing potential drops.When the forward of comparator U201 is inputted greater than reverse input, high level of signal conversion unit 200 outputs is to MCU, when forward was inputted less than reverse input, therefore low level of signal conversion unit 200 outputs can realize the detecting to outside level variation to MCU.
When the discrete signal of input is high level, if be the discrete input greater than 28V, diode D101 ended this voltage and was input to device interior this moment, the 28V voltage of VCC1 by resistance R 101, resistance R 201, resistance R 202 minutes the anode voltage of diode D101 is about 19.2V, the forward of comparator U201 is input as 3.2V, greater than the 1.77V that sets, signal conversion unit 200 is exported high level at this moment; When the discrete signal of input is low level, if input low level is 0V, (can set by the value of configuration resistance R 101, resistance R 201, resistance R 202 for low level the setting, at present system control box is set as less than 10.6V) the anode voltage maximum of diode D101 is about 0.7V, the forward of comparator U201 is input as 0.011V, less than the 1.77V that sets, this moment signal conversion unit 200 output low levels, therefore MCU detects discrete input variation, then does corresponding processing.
Another purpose of the present utility model is to provide a kind of air electronics, and described air electronics comprises the control circuit that input is connected with the input and output connector of peripheral hardware, output is connected with the MCU of air electronics, and described control circuit comprises:
Input is connected with the input and output connector of described peripheral hardware, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit 100 of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit, and output is connected with the MCU of described air electronics, will be converted to through the discrete signal of Overvoltage protecting unit the signal conversion unit 200 of the discrete signal of back-end circuit use.
As the utility model one embodiment, described Overvoltage protecting unit 100 comprises:
Diode D101, resistance R 101;
The negative electrode of described diode D101 is as the input of described Overvoltage protecting unit 100; be connected with input and output connector; the anode of described diode D101 is as the output of described Overvoltage protecting unit 100; be connected with the first end of resistance R 101, the second end of described resistance R 101 is connected with the first power supply VCC1.
As the utility model one embodiment, the voltage of described the first power supply VCC1 is 28V.
As the utility model one embodiment, described signal conversion unit 200 comprises:
Resistance R 201, resistance R 202, resistance R 203, resistance R 204, resistance R 205, resistance R 206, resistance R 207, capacitor C 201, capacitor C 202, capacitor C 204, comparator U201;
the first end of described resistance R 201 is as the input of described signal conversion unit 200, the second end of described resistance R 201 respectively with the first end of capacitor C 201, the first end of resistance R 202, the first end of the inverting input of comparator U201 and resistance R 205 connects, the second end of described capacitor C 201 is connected with the second end and the ground of resistance R 202 respectively, the in-phase input end of comparator U201 is connected with the first end of resistance R 203 and the first end of resistance R 204 respectively, the second end of described resistance R 203 is connected with power supply VCC2, the second end ground connection of described resistance R 204, the earth terminal ground connection of described comparator U201, the power end of described comparator U201 respectively with power supply VCC2, the first end of the first end of capacitor C 202 and capacitor C 203 connects, the second end of described capacitor C 202 is connected with the second end and the ground of capacitor C 203 respectively, the output of described comparator U201 respectively with the second end of resistance R 205, the first end of the first end of resistance R 206 and resistance R 207 connects, the second end of described resistance R 206 is connected with power supply VCC2, the second end of resistance R 207 is as the output of described signal conversion unit 200, be connected with described MCU.
As the utility model one embodiment, the voltage of described power supply VCC2 is 5V.
In the utility model, when the overtension of not come by the peripheral apparatus input damages, can respond at any time again the variation of peripheral apparatus level when guaranteeing one's own side's equipment in interconnection.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. the control circuit of a discrete input, input is connected with input and output connector, and output is connected with MCU, it is characterized in that, and the control circuit of described discrete input comprises:
Input is connected with described input and output connector, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit, and output is connected with described MCU, will be converted to through the discrete signal of Overvoltage protecting unit the signal conversion unit of the discrete signal of back-end circuit use.
2. the control circuit of discrete input as claimed in claim 1, is characterized in that, described Overvoltage protecting unit comprises:
Diode D101, resistance R 101;
The negative electrode of described diode D101 is as the input of described Overvoltage protecting unit; be connected with input and output connector; the anode of described diode D101 is as the output of described Overvoltage protecting unit; be connected with the first end of resistance R 101, the second end of described resistance R 101 is connected with the first power supply VCC1.
3. the control circuit of discrete input as claimed in claim 2, is characterized in that, the voltage of described the first power supply VCC1 is 28V.
4. the control circuit of discrete input as claimed in claim 1, is characterized in that, described signal conversion unit comprises:
Resistance R 201, resistance R 202, resistance R 203, resistance R 204, resistance R 205, resistance R 206, resistance R 207, capacitor C 201, capacitor C 202, capacitor C 204, comparator U201;
the first end of described resistance R 201 is as the input of described signal conversion unit, the second end of described resistance R 201 respectively with the first end of capacitor C 201, the first end of resistance R 202, the first end of the inverting input of comparator U201 and resistance R 205 connects, the second end of described capacitor C 201 is connected with the second end and the ground of resistance R 202 respectively, the in-phase input end of comparator U201 is connected with the first end of resistance R 203 and the first end of resistance R 204 respectively, the second end of described resistance R 203 is connected with power supply VCC2, the second end ground connection of described resistance R 204, the earth terminal ground connection of described comparator U201, the power end of described comparator U201 respectively with power supply VCC2, the first end of the first end of capacitor C 202 and capacitor C 203 connects, the second end of described capacitor C 202 is connected with the second end and the ground of capacitor C 203 respectively, the output of described comparator U201 respectively with the second end of resistance R 205, the first end of the first end of resistance R 206 and resistance R 207 connects, the second end of described resistance R 206 is connected with power supply VCC2, the second end of resistance R 207 is as the output of described signal conversion unit, be connected with described MCU.
5. the control circuit of discrete input as claimed in claim 4, is characterized in that, the voltage of described power supply VCC2 is 5V.
6. an air electronics, is characterized in that, described air electronics comprises the control circuit that input is connected with the input and output connector of peripheral hardware, output is connected with the MCU of air electronics, and described control circuit comprises:
Input is connected with the input and output connector of described peripheral hardware, input discrete signal and prevent that too high voltages from damaging the Overvoltage protecting unit of back-end circuit;
Input is connected with the output of described Overvoltage protecting unit, and output is connected with the MCU of described air electronics, will be converted to through the discrete signal of Overvoltage protecting unit the signal conversion unit of the discrete signal of back-end circuit use.
7. air electronics as claimed in claim 6, is characterized in that, described Overvoltage protecting unit comprises:
Diode D101, resistance R 101;
The negative electrode of described diode D101 is as the input of described Overvoltage protecting unit; be connected with input and output connector; the anode of described diode D101 is as the output of described Overvoltage protecting unit; be connected with the first end of resistance R 101, the second end of described resistance R 101 is connected with the first power supply VCC1.
8. air electronics as claimed in claim 7, is characterized in that, the voltage of described the first power supply VCC1 is 28V.
9. air electronics as claimed in claim 6, is characterized in that, described signal conversion unit comprises:
Resistance R 201, resistance R 202, resistance R 203, resistance R 204, resistance R 205, resistance R 206, resistance R 207, capacitor C 201, capacitor C 202, capacitor C 204, comparator U201;
the first end of described resistance R 201 is as the input of described signal conversion unit, the second end of described resistance R 201 respectively with the first end of capacitor C 201, the first end of resistance R 202, the first end of the inverting input of comparator U201 and resistance R 205 connects, the second end of described capacitor C 201 is connected with the second end and the ground of resistance R 202 respectively, the in-phase input end of comparator U201 is connected with the first end of resistance R 203 and the first end of resistance R 204 respectively, the second end of described resistance R 203 is connected with power supply VCC2, the second end ground connection of described resistance R 204, the earth terminal ground connection of described comparator U201, the power end of described comparator U201 respectively with power supply VCC2, the first end of the first end of capacitor C 202 and capacitor C 203 connects, the second end of described capacitor C 202 is connected with the second end and the ground of capacitor C 203 respectively, the output of described comparator U201 respectively with the second end of resistance R 205, the first end of the first end of resistance R 206 and resistance R 207 connects, the second end of described resistance R 206 is connected with power supply VCC2, the second end of resistance R 207 is as the output of described signal conversion unit, be connected with described MCU.
10. air electronics as claimed in claim 9, is characterized in that, the voltage of described power supply VCC2 is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609661 CN202998052U (en) | 2012-11-16 | 2012-11-16 | Discrete input control circuit and airplane electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220609661 CN202998052U (en) | 2012-11-16 | 2012-11-16 | Discrete input control circuit and airplane electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202998052U true CN202998052U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220609661 Expired - Lifetime CN202998052U (en) | 2012-11-16 | 2012-11-16 | Discrete input control circuit and airplane electronic device |
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| Country | Link |
|---|---|
| CN (1) | CN202998052U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10365304B2 (en) | 2017-10-06 | 2019-07-30 | Ge Aviation Systems Llc | Discrete input determining circuit and method |
-
2012
- 2012-11-16 CN CN 201220609661 patent/CN202998052U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10365304B2 (en) | 2017-10-06 | 2019-07-30 | Ge Aviation Systems Llc | Discrete input determining circuit and method |
| US10690702B2 (en) | 2017-10-06 | 2020-06-23 | Ge Aviation Systems Llc | Discrete input determining circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190225 Address after: 518000 Guangzhou Nanshan Nantou Street Pass No. 2 Zhiheng Strategic Emerging Industrial Park, 1 Building and 1 Floor Patentee after: Shenzhen Donika Avionics Co.,Ltd. Address before: 518000 High-tech Industrial Park, Nanshan District, Shenzhen, Guangdong Province (North District) Patentee before: DONICA AVIATION ENGINEERING Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |